[CodeComplete] Use PrintOptionalAsImplicitlyUnwrapped to print IUO

Other instances of fb9c65e. Consistently use
PrintOption.PrintOptionalAsImplicitlyUnwrapped to print IUO.

rdar://problem/41046225
rdar://problem/42443512

Author: rintaro

lib/IDE/CodeCompletion.cpp

@@ -2559,16 +2559,17 @@ class CompletionLookup final : public swift::VisibleDeclConsumer {
         // What's left is the result type.
         if (ResultType->isVoid()) {
           OS << "Void";
-        } else if (!IsImplicitlyCurriedInstanceMethod
-                   && FD->getAttrs().hasAttribute<ImplicitlyUnwrappedOptionalAttr>()) {
+        } else {
           // As we did with parameters in addParamPatternFromFunction,
           // for regular methods we'll print '!' after implicitly
           // unwrapped optional results.
-          auto ObjectType = ResultType->getOptionalObjectType();
-          OS << ObjectType->getStringAsComponent();
-          OS << "!";
-        } else {
-          ResultType.print(OS);
+          bool IsIUO =
+              !IsImplicitlyCurriedInstanceMethod &&
+              FD->getAttrs().hasAttribute<ImplicitlyUnwrappedOptionalAttr>();
+
+          PrintOptions PO;
+          PO.PrintOptionalAsImplicitlyUnwrapped = IsIUO;
+          ResultType.print(OS, PO);
         }
       }
       Builder.addTypeAnnotation(TypeStr);

lib/IDE/CodeCompletionResultBuilder.h

@@ -372,13 +372,8 @@ class CodeCompletionResultBuilder {
 
     PrintOptions PO;
     PO.SkipAttributes = true;
-    std::string TypeName;
-    if (IsIUO) {
-      assert(Ty->getOptionalObjectType());
-      TypeName = Ty->getOptionalObjectType()->getStringAsComponent(PO) + "!";
-    } else {
-      TypeName = Ty->getString(PO);
-    }
+    PO.PrintOptionalAsImplicitlyUnwrapped = IsIUO;
+    std::string TypeName = Ty->getString(PO);
     addChunkWithText(CodeCompletionString::Chunk::ChunkKind::CallParameterType,
                      TypeName);
 

test/IDE/complete_crashes.swift

@@ -306,18 +306,28 @@ func test_28188259(x: ((Int) -> Void) -> Void) {
 func test_40956846(
   arg_40956846_1: inout Int!,
   arg_40956846_2: Void!,
-  arg_40956846_3: (() -> Int)!,
+  arg_40956846_3: (() -> Int?)!,
   arg_40956846_4: inout ((Int) -> Int)!
 ) {
   let y = #^RDAR_40956846^#
 }
 // RDAR_40956846: Begin completions
 // RDAR_40956846-DAG: Decl[LocalVar]/Local:               arg_40956846_1[#inout Int!#]; name=arg_40956846_1
 // RDAR_40956846-DAG: Decl[LocalVar]/Local:               arg_40956846_2[#Void!#]; name=arg_40956846_2
-// RDAR_40956846-DAG: Decl[LocalVar]/Local:               arg_40956846_3[#(() -> Int)!#]; name=arg_40956846_3
+// RDAR_40956846-DAG: Decl[LocalVar]/Local:               arg_40956846_3[#(() -> Int?)!#]; name=arg_40956846_3
 // RDAR_40956846-DAG: Decl[LocalVar]/Local:               arg_40956846_4[#inout ((Int) -> Int)!#]; name=arg_40956846_4
 // RDAR_40956846: End completions
 
+// rdar://problem/42443512
+// RUN: %target-swift-ide-test -code-completion -code-completion-token=RDAR_42443512 -source-filename=%s | %FileCheck %s -check-prefix=RDAR_42443512
+class test_42443512 {
+  func foo(x: Int!) { }
+  static func test() {
+    self.foo#^RDAR_42443512^#
+  }
+}
+// RDAR_42443512: Begin completions
+
 // rdar://problem/42452085
 // RUN: %target-swift-ide-test -code-completion -code-completion-token=RDAR_42452085_1 -source-filename=%s | %FileCheck %s -check-prefix=RDAR_42452085
 // RUN: %target-swift-ide-test -code-completion -code-completion-token=RDAR_42452085_2 -source-filename=%s | %FileCheck %s -check-prefix=RDAR_42452085